Chromium-nickel alloy electroplating solution and electroplating method

A technology of electroplating solution and nickel alloy, which is applied in the field of electroplating solution, and can solve problems such as complex formula, insufficient dispersion ability and deep plating ability of electroplating solution, poor hardness and corrosion resistance of the coating, etc.

Inactive Publication Date: 2015-04-15
WUXI HUAYE IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the existing chromium-nickel alloy electroplating solution adopts trivalent chromium to meet the requirements of environmental protection and greenness, the dispersion ability and deep plating ability of the electroplating solution are not enough, the hardness and corrosion resistance of the coating are not good, and the formula is relatively complicated

Method used

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  • Chromium-nickel alloy electroplating solution and electroplating method
  • Chromium-nickel alloy electroplating solution and electroplating method
  • Chromium-nickel alloy electroplating solution and electroplating method

Examples

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Effect test

Embodiment 1

[0029] The formula of chromium-nickel alloy electroplating solution is as follows:

[0030] Table 1-1 Chromium-nickel alloy electroplating solution

[0031]

[0032] Plating process conditions: the frequency of square wave pulse current is 100Hz, the duty cycle is 15%, and the average current density is 10A / dm 2 ; The pH is 2, the temperature is 30° C., and the time is 80 minutes.

Embodiment 2

[0034] The formula of chromium-nickel alloy electroplating solution is as follows:

[0035] Table 2-1 Chromium-nickel alloy electroplating solution

[0036]

[0037] Plating process conditions: the frequency of square wave pulse current is 1000Hz, the duty cycle is 30%, and the average current density is 30A / dm 2 ; The pH is 4, the temperature is 60° C., and the time is 250 minutes.

Embodiment 3

[0039] The formula of chromium-nickel alloy electroplating solution is as follows:

[0040]Table 3-1 Chromium-nickel alloy electroplating solution

[0041]

[0042] Plating process conditions: the frequency of square wave pulse current is 650Hz, the duty cycle is 25%, and the average current density is 20A / dm 2 ; The pH is 3, the temperature is 45° C., and the time is 160 minutes.

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Abstract

The invention discloses a chromium-nickel alloy electroplating solution and an electroplating method. The chromium-nickel alloy electroplating solution includes: 90-120g/L chromium chloride hexahydrate, 25-50g/L nickel sulfate hexahydrate, 50-70g/L ammonium bromide, 130-140g/L citric acid, 55-70g/L formic acid, 0.3-0.5g/L an emulsifier and the balance a solvent. The solvent is a mixed solution of DMF and water in a volume ratio of (0.8-1.05):1. The chromium-nickel alloy electroplating solution provided by the invention adopts the mixed solution of DMF and water as the solvent of the electroplating solution, citric acid and formic acid are taken as the compound complexing agent, citric acid and formic acid are selected as the buffering agent to replace boric acid, thus simplifying the formula, enhancing the hardness and corrosion resistance of the coating, and improving the dispersion ability and deep plating ability of the electroplating solution.

Description

technical field [0001] The invention relates to the technical field of electroplating solutions, in particular to a chromium-nickel alloy electroplating solution and an electroplating method. Background technique [0002] Chromium coating has the advantages of high hardness, good wear resistance and strong corrosion resistance, and has been widely used as a wear-resistant and decorative coating in industry. However, chromium plating softens at higher temperatures. The hardness value begins to decrease at 300°C, and the coating is in a fully annealed state at 510°C; in addition, the chromium coating generally has a micro-crack structure (thickness greater than 0.7 microns). These microcrack structures may be filled by adsorbates, thereby reducing the coating's ability to protect the substrate. Replacing the single-metal chromium coating with Ni-Lu alloy can alleviate the above problems and make the coating have high temperature resistance and hardness. [0003] Chinese pat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56
CPCC25D3/56
Inventor 张明
Owner WUXI HUAYE IRON & STEEL
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